Composite impact material surface strengthening method and device

Abstract

The invention discloses a composite impact material surface strengthening method and a device based on laser shock wave and electromagnetic pulse. A computer central processing unit controls a laser and an electromagnetic pulse device to act on a specimen panel simultaneously, an adjustable external optical path system alters the path of laser beam, a facula regulating device regulates the size of facula of the laser beam; meanwhile an electromagnetic pulse controller starts an electromagnetic force generation system to ensure that metal specimen panel suffers from dual strengthening effects of laser and electromagnetic pulse, pulse laser and electromagnetic pulse can integrally impact the surface of complex curved surface by adjusting the movement and the rotation of a multi axial coordinate platform, thereby realizing three-dimensional stereoscopic impact. The invention can prevent the surface of the material from generating harmful remnant tensile stress, is applicable to pinhole for fatigue strengthening, damage restoration and reproducing, prevents crack from propagating, eliminates welding stress, and enhances resistance to stress corrosion.

Description

technical field [0001] The invention relates to the technical field of surface strengthening of large materials and microstructure strengthening of small materials, which can improve the magnitude and distribution of material surface stress and increase the service life of metal workpieces. In particular, it refers to a method and device for surface strengthening of composite shock materials based on laser shock waves and electromagnetic pulses, especially suitable for components that require fatigue resistance and stress corrosion resistance. Background technique [0002] Traditional material modification techniques include forging, cold extrusion, laser heat treatment and mechanical shot peening, etc., to generate residual compressive stress inside the sheet to achieve the purpose of strengthening, but there are long production preparation time, poor processing flexibility and The manufacturing cost is high and so on. At present, laser processing technology and material l...

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Problems solved by technology

[0003] After searching the current foreign literature, "ACTIVE BEAM DELIVERY SYSTEM FOR LASERPEENING AND LASER PEENING METHOD" by DANE C BRENT[US]; HARRIS FRITZ B[US]; TARANOWSKI JOSEPHT[US] and others in August 2007, the patent number is KR20070086485( A), introduces a movable laser beam to carry out laser shot peening on the surface of the material, that is, when the workpiece is fixed, through the laser delivery system, the laser beam can complete the shot peening of the sheet along a certain optical path , its defects are as follows: (1) The process of moving the beam is complicated and difficult to control precisely

(2) Although it can hit the surface of the material many times according to a certain path, it is difficult to solve the problem of unreasonable distribution of residual stress in the laser shot peening process

(3) It is difficult to deal with the overlapping joints when the surface of the material is laser peened multiple times, and it is impossible to ensure the uniform distribution of residual compressive stress at the overlapping joints after laser peening

(4) Parts with complex curved surfaces cannot be strengthened, and it is impossible to ensure that the transition of complex curved surfaces can obtain a better strengthening effect after laser peening

[0004] There is currently no prior art for treating material surfaces with electromagnetic pulse devices

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